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nucleophile
(redirected from Nucleophilicity)

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nucleophile

Atom or molecule that contains an electron pair available for bonding and in chemical reactions therefore seeks a positive centre, such as the nucleus of an atom or the positive end of a polar molecule (see covalent bond; electric dipole). In the Lewis electron theory (see acid-base theory), advanced by the U.S. chemist Gilbert Lewis (1875–1946) in 1923, nucleophiles are by definition Lewis bases. Examples include the hydroxide ion (OH−), the ions of the halogens chlorine, bromine, and iodine (Cl−, Br−, and I−, respectively), ammonia (NH3), and water (H2O). See also base; electrophile.

nucleophile [′nü·klē·ə‚fīl]
(physical chemistry)
A species possessing one or more electron-rich sites, such as an unshared pair of electrons, the negative end of a polar bond, or pi electrons. Also known as electron donor.
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5-7) The aim of this work was to prepare hyperbranched polyesters bearing amine groups of low nucleophilicity due to H-bonding.
Hydrogen bonding effects on aspartate ester reactions by Williams, C.T.; Wicks, D.A.; Jarrett, W.L. / JCT Research
Without study of the kinetics of polymerization, it is difficult to speak about the rate and rate constants of a reaction, nevertheless, it is reasonable to suppose that the nucleophilicity of phenol is the dominating force of this reaction.
Synthesis and polymerization reactions of cyclic imino ethers. II. ... by Luston, J.; Kronek, J. / Polymer Engineering and Science
Thus it is possibly established that the -OH group in aromatic linkages increases its degree of nucleophilicity, which in turn increases its linkage with the polymer.
Novel approach of rubber-filler interaction through surface ... by Banerjee, A.N. / Rubber World
 
 
 
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